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☆☆☆☆☆A septagon.
Heptagon
A regular nonagon is a shape with 9 equal sides, right? Well, with the equation (n-2)180, where n is the number of sides, you can find the sum of the interior angles. Then you divide that number by n to get the measure of each interior angle. You do the rest.
If your in A+:140'
180
It is generally accepted to count only one vertex per side when calculating the sum of exterior angles. If this is what you mean, then for every convex polygon (all angles point away from center), the sum is always 360º.
However, you can also count two vertexes per side, so the sum would then be double, or 720º.
The chord that passes through the centre is the biggest chord in a circle and it is the diameter.
Complementary
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Segment HP
4
You have to multiply base x height - in this case, you obtain (4a)(2a+b). This can't be simplified; you can leave it as it is (factored), or multiply it out to obtain 8a2 + 4ab.
23.53
The surface area of a cylinder that has a radius of 6 inches and a height of 12 inches is 678.58 square inches.
