1.分一分,填一填。
______________是平行四边形 ______________是梯形
______________是平行四边形 ______________是梯形
答案:
①③⑥⑦ ②⑤
2.求下列等腰三角形的内角度数,填一填。

答案:
(180° - 30°)÷2 = 75° 90°÷2 = 45°
(180° - 120°)÷2 = 30° 180° - 70°×2 = 40°
180° - 80°×2 = 20° 180° - 25°×2 = 130°
(180° - 30°)÷2 = 75° 90°÷2 = 45°
(180° - 120°)÷2 = 30° 180° - 70°×2 = 40°
180° - 80°×2 = 20° 180° - 25°×2 = 130°
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