Question

1. In DABC, if BC = AB and ∠B = 80° then ∠A will be equal to​

Answer 1

Answer:

100 degree

Step-by-step explanation:

80+ angle a equals to 180 degree

angle a : 180-80

100 degree

Answer 2

Question:

In DABC, if BC = AB and ∠B = 80° then ∠A will be equal to

Solution:

$\tt \: BC=AB$

$\tt \: ⇒∠A=∠C$

$\tt \: Assuming \: each \: angle \: be \: X$

$\tt \red {By \: angle \: sum \: property}$

$\tt \: ∠A+∠B+∠C=180 \\ \tt⇒80 + x +x=180 \\ \tt⇒2x=180 −80 \\ \tt⇒2x=100 \\ \tt⇒x=50 \\ \tt∴∠A=50$