Question

isosceles triangle
angle A=X
angle C=7X
angle B=7X
i need to find the value of B but cant work it out can someone please help me? thank you

Answer 1

Answer:

84

Step-by-step explanation:

7x + 7x + x = 180

15x = 180

so x = 12

B = 7×12 = 84

Answer 2

Answer:

angle B = 84

Step-by-step explanation:

we know that sum of all angles is 180°

therefore,

angle A + angle B + angle C = 180

x + 7x + 7x = 180

15x=180

x = 12

we know that angle B = 7x

put x=12

therefore,

7×12=84

angle B = 84