Question

in trapezul dreprunghic ABCD, AB>CD,m(Â)=90 grade si m (ABC)=2/7 × m(BCD) . Afla m(ABC) si m (BCD)

Answer 1

<) B+C =180 grade
<) B =2*C /7

2C/7 +C =180   numitor 7
2C +7C =1260
9C =1260
C =140 gr.
B =2C/7 =2*140/7 =40 gr.