It is B because yiu solve
Answer:
70 degrees
Step-by-step explanation:
total angle in a triangle is 180 degrees
180-40= 140
Angle b and c is total of 140 degrees
they are isosceles so their measurements would be same.
angle b and c is 140÷ 2 = 70
so angle b is 70 degrees
Answer:
15a
Step-by-step explanation:
Because 5(a + a + a) = 5 * (3a) = 15a