rose0753 rose0753
  • 25-11-2020
  • Mathematics
contestada

What is the value of a?

What is the value of a class=

Respuesta :

maggiem1900
maggiem1900 maggiem1900
  • 25-11-2020

Answer:

66

Step-by-step explanation:

The sum of all of the angles in a triangle is 180. So all three angles would add up to 180:

(a + 21) + 57 + (a - 30) = 180

Combine like terms:

2a + 48 = 180

2a = 132

a = 66

Answer Link
stylesben46
stylesben46 stylesben46
  • 25-11-2020

Answer:

a+21+57+a-30=180(angle of triangle)

2a+48=180

2a=180-48

2a=132

a=132/2

a=66

then,a+21=66+21 =87

a-30=66-30 =36

Step-by-step explanation:

I think this is the answer

Answer Link

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