3 years ago

What is the measure of 21? 100° 90° 80° 85° 95%

Mathematics

1 answer:

Scorpion4ik [409]3 years ago

8 0

Answer:

A quadrilateral's interior angles have a sum of 360°.

Given that we have 85°, 100°, and 90°(the right angle), and an unknown angle.

We can add these angles plus the unknown angle to equal a total of 360°.

85 + 100 + 90 + x(our unknown missing angle) = 360

simplify

275 + x = 360

Isolate x by subtract 275 from both sides;

-275 -275

x = 85, ∠1 = 85°

We can also double check:-

85 + 100 + 90 + <u>85</u> = 360

360 = 360 which is correct.

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What is the measure of 21? 100° 90° 80° 85° 95%​

What is the measure of 21? 100° 90° 80° 85° 95%