Math topic中文
Angle sum polygon
angle sum of interior and exterior angles of any convex polygon
Practice questions
- 1关于长方形和平行四边形的共同特点,有如下一些说法: ①对边平行;②对边相等;③四个角的和是360°;④都是轴对称图形 以上说法正确的是( ) A. ①②和③ B. ①②和④ C. ①③和④ D. ②③和④
- 2The figure is made up of a regular pentagon ABCDE and a regular hexagon CDFGHI. Find angle BCI. Answer ... ° Determine w…
- 3下列命题是假命题的是 A. 三角形的内角和是180 ° B. 多边形的外角和都等于360° C. 五边形的内角和是900° D. 三角形的一个外角等于和它不相邻的两个内角的和
- 4从九边形的一个顶点出发可以引出___条对角线 A. B. C. D.
- 5若n边形的每个内角为150°,则这个n边形是( ) A. 九边形 B. 十边形 C. 十一边形 D. 十二边形
- 6The diagram shows a regular hexagon P and a regular n-sided polygon Q. Polygon Q has an exterior angle of 18°. Find the…
- 7若正多边形的内角和是540°,那么这个多边形一定是正 边形.
- 8边形的每个外角都为,则边数为 A. B. C. D.
- 9一个多边形除了一个内角外,其余各内角之和为那么除去的这个内角的度数为 ___ .
- 10The diagram shows a circle PQRST, with centre O. PV and RV are tangents to the circle and U is the intersection of PS an…
- 11In the diagram ABCDE is a regular pentagon. BE and BD are straight lines. Find, giving reasons for each answer, angle AB…
- 12A, B and C are points on the circle with centre O. Q and R are points on the circle with centre P. CSR and BSQ are tange…
- 13正多边形的一个内角是,则这个正多边形的边数为 A. B. C. D.
- 14一个多边形的每个内角都相等,且它们的每个内角比其相邻的外角大60°,求这个多边形的边数.
- 15Find the area of a regular hexagon with each side 7 cm. Answer ... cm^2 Find the interior angle of a regular 15-sided po…
- 16The diagram shows a part of a regular n-sided polygon. Given ∠a + ∠b = 72°, find the value of n. Answer n = ...
- 17已知一个多边形的内角和是它的外角和的2倍,那么这个多边形的边数是( ) A. 3 B. 4 C. 6 D. 5
- 18一个多边形的每个内角都等于,则此多边形是 A. 五边形 B. 六边形 C. 七边形 D. 八边形
- 19若一个正多边形的一个内角是120°,则这个正多边形的边数是( ) A. 9 B. 8 C. 6 D. 4
- 20若多边形的内角和为,此多边形的边数为 A. B. C. D.
- 21若多边形的每一个外角都等于60°,则该多边形的边数是 .
- 22The diagram below shows part of a regular 18-sided polygon, ABCDEF... The lines BC and ED are extended to meet at the po…
- 23一个多边形的每一个外角都是72°,则这个多边形是( ) A. 正方形 B. 正五边形 C. 正六方形 D. 正七边形
- 24用三块正多边形的木块铺地,拼在一起后,相交于一点的各边完全吻合,设其边数为4,6,m,则m的值是( ) A. 3 B. 5 C. 8 D. 12
- 25The diagram above shows a kite ABCD where angle BAC = 30°. EB, BD and DF are three sides of a regular polygon. ABE and A…
- 26The diagram shows a pentagon. Three of the interior angles are 100° each. One of its exterior angle is 50°. Find the val…
- 27某人到瓷砖商店去买一种多边形形状的瓷砖,用来铺设无缝地板,他购买的瓷砖形状不能是( ) A. 正三角形 B. 正方形 C. 正五边形 D. 正六边形
- 28Regular pentagons and squares of the same sides are placed together in a pattern as shown in the diagram. Caleb claims t…
- 29A regular polygon has interior angles of 140°. Find the number of sides of the polygon The diagram shows a sketch of a r…
- 30若铺地面的瓷砖每一个顶点处都有六个相同的正多边形组成,则这种正多边形只能是( ) A. 正三角形 B. 正方形 C. 正五边形 D. 正六边形
- 31一个正多边形的每一个内角都等于140°,则它的每一个外角都等于 度,它是 边形.
- 32一个凸多边形的每一个内角都等于,那么从一个顶点出发的对角线有___条,共有___条对角线.
- 33已知一个多边形的边数恰好是从一个顶点出发的对角线条数的2倍,则这个多边形的边数是 ,内角和是 .
- 34如果一个多边形的内角和为1800°,那么这个多边形是 边形,它的外角和等于 .
- 35在现实生活中,铺地最常见的是用正方形地板砖,某小区广场准备用多种地板砖组合铺设,则能够选择的组合是 A. 正六边形,正八边形 B. 正方形,正七边形 C. 正五边形,正六边形 D. 正三角形,正方形
- 36用边长相同的正三角形、正方形、正六边形、正八边形、正十边形进行密铺,每个交叉点只允许五块进行密铺,它有 种铺法.
- 37一个边形的内角和比外角和多,则 ___ .
- 38In the diagram, A, B C and D lie on a circle, centre O. PQ and PR are tangents to the circle at A and D respectively. It…
- 39一个多边形的内角和是1800°,那么这个多边形是( ) A. 五边形 B. 八边形 C. 十边形 D. 十二边形
- 40The diagram shows part of three regular polygons A, B and C fit together at a common vertex. Polygon A is an icosagon, a…
- 41正边形每个内角的大小都为,则 A. B. C. D.
- 42下面各角能成为某多边形的内角和的是 ( ) A. 430° B. 4320° C. 4334° D. 4360°
- 43已知一个十边形的每个内角都相等,那么这个十边形的内角度数是 ___ .
- 44菱形具有而矩形不一定具有的性质是 ( ) A. 内角和等于 B. 对角相等 C. 对边平行且相等 D. 对角线互相垂直
- 45The diagram shows a regular pentagon and a regular octagon. Calculate the value of . Answer x = ...
- 46A new tile-making company is exploring using a regular hexagon and a regular octagon to make tiles. The company will use…
- 47The diagram shows a regular 12-sided polygon inscribed in a circle and a right-angled triangle PQR with length …
- 48若一个多边形被截去一个角后,其内角和变为,则原多边形的边数为___。
- 49利用边长相等的正三角形和正六边形的地砖镶嵌地面时,在每个顶点周围有a块正三角形和b块正六边形的地砖(a、b都不为0),则a+b的值为 .
- 50For a regular polygon with n sides, the ratio of the size of an interior angle to its exterior angle is 7 : 2. Find the…
- 51正n边形的内角和等于1080°,则n= ,一个正五边形的内角和为 .
- 52The ratio of interior angle : exterior angle of a regular polygon is 5 : 1. Calculate the number of sides that the polyg…
- 53The figure is made up of a 7-sided regular polygon with centre O, a triangle OAG and a parallelogram OHFG, where GF is p…
- 54A regular polygon has sides. When the number of sides is doubled, each of the interior angles is increased by 30°. F…
- 55The diagram shows a regular pentagon and a regular octagon. Calculate the value of x. Answer x = ...
- 56The diagram shows a hexagon. Three interiors angles are as shown. The remaining three interior angles are equal. Find x.…
- 57一个多边形的内角和等于它的外角和的5倍,那么此多边形的边数为 ___ .
- 58如果一个多边形的内角和是外角和的倍,那么这个多边形是 A. 四边形 B. 六边形 C. 八边形 D. 十边形
- 59The sizes of four of the exterior angles of a decagon are in the ratio 1 : 2 : 2 : 3. The remaining exterior angles are…
- 60The figure below is made up of 2 identical 4-sided figures. Find the sum of . Ans: ___ …