“When seen from the side however, it has an almost perfect semicircle curve.” Though most men are unlikely to think much about their bums, research has shown that it’s one of the body parts ...
When a triangle is formed inside a semicircle, two lines from either side of the diameter meet at a point on the circumference at a right angle. The angle in a semicircle is a right angle of \(90 ...
Remember that the perimeter is the distance round the outside. The perimeter of a semicircle is half of the circumference plus the diameter.