Need to find missing angles a b c d e

∠d and ∠70° are vertical angles.

Vertical angles are equal. Therefore m∠d = 70°.

∠a and ∠70°, ∠a and ∠b, ∠c and ∠b, ∠c and ∠d are complementary angles.

The sum of measures the two complementary angles is 90°. Therefore

m∠a = 90° - 70° = 20°

m∠b = 90° - 20° = 70°

m∠c = 90° - 70° = 20°

m∠d = 90° - 20° = 70°

heyyy

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116