It is: 20*7 = 140 square cm
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The area of a regular hexagon with side length of 20cm is about 1039.23cm2
Area 51.
A triangle with side a: 7, side b: 7, and side c: 5 cm has an area of 16.35 square cm.
Area = 120 x 20 = 2400 cm2
To calculate the area of a triangle, you use the formula: Area = 0.5 x base x height. Plugging in the values given, the area of the triangle would be 0.5 x 18cm x 20cm = 180 square centimeters.