Does anyone know the answer to number 1, because I need to know ASAP
2 answers:
The formula for the sum of the interior angles of a regular polygon in degrees is , where
is the number of sides on the polygon.
In the case of a regular pentagon with five sides, we can say that . Using the formula below, we can find the sum of the interior angles of the pentagon:
The sum of the interior angles is 540°.
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Answer:
Step-by-step explanation:
First we'll work out the surface area of the pink figure.
That's the area of the two 5 by 6 rectangles on the top and bottom, plus the area of the two 5 by 20 and two 6 by 20 rectangles on the sides.
However, we note that the purple figure is blocking out a 6 by 12 section on the pink figure, so we'll need to subtract this.
The above works out to .
Then we'll work out the surface area of the purple figure.
This will be the area of the two 4 by 6 rectangles at the top and bottom, plus the area of the two 4 by 12 and one 6 by 12 rectangles on the sides. Note that there's only one 6 by 12 rectangle because the other face is joined to the pink figure, so it's blocked out.
That's .
So the total surface area is .