下图未按比例绘制。ABE 是等边三角形,BCD 是等腰三角形。ABC 和 BDF 是直线,且 AC // EF。∠EBD = 90° 且 ∠BED = 43°。

- (a)
求 ∠CBF。
- (b)
求 ∠BDC。
- (c)
求 ∠EDF。
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完整解法
16(a)
1. Find $\angle ABE$ using the properties of an equilateral triangle.
Since triangle is equilateral,
2. Find $\angle CBF$ using vertically opposite angles.
Since and are straight lines, and are vertically opposite angles.
Therefore,
答案
16(c)
1. Find $\angle EDB$ using the sum of angles in $\triangle EBD$
In , the sum of angles is .
2. Find $\angle EDF$ using angles on a straight line
Since is a straight line, and are supplementary.
答案
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