Question

How would you solve this?

Answer 1

Answer:

Add all sides together, then divide it by 3. The answer is...

Step-by-step explanation:

54+80+64= 198 DIVIDED BY 3 = 66 so

66 = X

Answer 2

Answer:

x = -9

m∠A = 45°

Step-by-step explanation:

The interior angles of a triangle always add up to 180°, therefore:

$80+(x+54)+(x+64) = 180$

Combine like terms.

$(x+x)+(80+54+64)=180\\\\2x + 198=180$

Subtract 198 from both sides, then divide both sides by 2.

$2x=-18\\\\x=-9$

Solve for m∠A.

$m\angle A= x +54$

Plug in -9 for x.

$m\angle A= (-9) +54\\\\m\angle A= 45\textdegree$