|
De hoek in A van ΔABC meet 70°.
Verder spreekt de figuur voor zichzelf.
Hoe groot is de hoek in D ?
|
A. 30° |
|---|
| B. 35° |
| C. 40° |
| D. 45° |
| E. 50° |
[ 1-8913 - op net sinds 26.5.2024-(E)- ]
Translation in E N G L I S H
Oplossing - Solution
? = 180° – (180° – 2α) – (180° – 2β)
= 2α + 2β – 180°
= 2(α + β) – 180° (nu is α + β + 70° = 180°)
= 2.110° – 180°
= 220° – 180° = 40°
