3 years ago

Help please! thank you xoxo!2 math problems

Mathematics

1 answer:

Alex17521 [72]3 years ago

6 0

3. x = 45

4. 73°

Step-by-step explanation:

3. The sum of the interior angles of a pentagon is 540° so

90° + 112° + 2x + (2x + 10) + 148° = 540°

Simplifying this, we get

4x + 360 = 540 => 4x = 180 or x = 45

4. The sum of the interior angles of a pentagon is 540° which means that the unknown interior angle is 107°. This angle is a supplementary angle to $\angle{A}$ so $\angle{A}$ is

180° - 107° = 73°.

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