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sergiy2304 [10]
3 years ago
8

How many sides does a polygon have if the sum of its interior angles is 1,260º?

Mathematics
1 answer:
erica [24]3 years ago
3 0
The sum of interior angle is = 180(n-2) where n denotes the number of sides
so 1260° =180(n-2),  n -2= 1,280/180=7, so n=7+2=9
the answer is <span>C. 9

</span>
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Based on the definition of <em>composite</em> figure, the area of the <em>composite</em> figure ABC formed by a semicircle and <em>right</em> triangle is approximately 32.137 square centimeters.

<h3>How to find the area of the composite figure</h3>

The area of the <em>composite</em> figure is the sum of two areas, the area of a semicircle and the area of a <em>right</em> triangle. The formula for the area of the composite figure is described below:

A = (1/2) · AB · BC + (π/8) · BC²     (1)

If we know that AB = 6 cm and BC = 6 cm, then the area of the composite figure is:

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A ≈ 32.137 cm²

Based on the definition of <em>composite</em> figure, the area of the <em>composite</em> figure ABC formed by a semicircle and <em>right</em> triangle is approximately 32.137 square centimeters.

To learn more on composite figures: brainly.com/question/1284145

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Step-by-step explanation:

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ikadub [295]

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<h2>Learn more:</h2>

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