Find the perimeter and area of the following figure: below is a rectangle, 8dm long and 5DM wide. Above is a semicircle

Find the perimeter and area of the following figure: below is a rectangle, 8dm long and 5DM wide. Above is a semicircle

Perimeter = 8 + 5 + 5 + 8 × 3.14/2 = 30.56 (DM)
Area = 5 × 8 + 3.14 × 4 × 4 / 2 = 65.12 (DM2)

Find the perimeter and area of the following figures. The upper semicircle is inverted and the lower rectangle is 20 in length and 16 in width

The radius of the circle is 10
Perimeter = 3.14 * 10 + 2 * (20 + 36)
Area = (3.14 * 10 ^ 2) / 2 + 20 * 16

A rectangular sheet of iron, 30cm long and 20cm wide, cut a small square with 4cm side length from four corners, and then fold it along the dotted line to make a box without a cover. How many ml is the volume of the box?

The length of the box = 30-4-4 = 22 cm
Width = 20-4-4 = 12 cm
Height = 4cm
Volume = 22 × 12 × 4 = 1056 CC = 1056 ml

There is a rectangular sheet of iron 30cm long and 20cm wide. The square with 4cm side length is cut off from its four corners. It is just right to make an iron box without cover. The volume of the iron box can be calculated

30-4✘2=22