Answer:
x = 11
Step-by-step explanation:
The sum of angles in a triangle = 180°
From the question
In ΔBCD
m∠B=(8x+9) ∘
m∠C=(5x+5) ∘
m∠D=(2x+1) ∘
What is the value of x?
x is calculated as:
m∠B + m∠C + m∠D = 180°
(8x + 9)° + (5x + 5)° + (2x + 1)° = 180°
8x + 9 + 5x + 5 + 2x + 1 = 180°
Collect like terms
8x + 5x + 2x + 9 + 5 + 1 = 180°
15x + 15 = 180°
15x = 180° - 15°
15x = 165
x = 165/15
x = 11
Answer:
it is 15 degrees
Step-by-step explanation:
i dont know homework i guess
