Someone pls do these two questions for me

Hello!

Here's a break down of 8. and 9.

----------question 8:

For number 8., it asking you what is the sum of the Interior Angles of a polygon with 12 sides.

We know that a dodecagon is a 12-sided polygon with 12 angles and 12 vertices.

We also know that when you add up the angles it needs to equal a number.

When added up all the interior angles (angles within a polygon) of a polygon of 12 sides we get 1800°.

So the answer for 8. is 1800°

--------------question 9:

A quadrilateral has interior angles of 85°, 105°, and 120°. What is the measure of the 4th angle.

Remember that all quadrilaterals have 4 angles that add up to 360°.

So first: Add the given interior angles;

You get: 310

Next subtract the 310° from 360°

You get 50°

The measure of the 4th angle is 50°.

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I hope this helps you,

Have a great day!!

2500

step-by-step explanation: