JAMB - Mathematics (1979 - No. 13)
A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?
20sq.cm
100sq.cm
25sq.cm
16sq.cm
36sq.cm
Giải thích
Area of a square = 4(5) where S is each sides of the square
Perimeter = 20(given)
4S = 20
S = \(\frac{20}{4}\)
= 5
Area s2 = 52
= 25
Perimeter = 20(given)
4S = 20
S = \(\frac{20}{4}\)
= 5
Area s2 = 52
= 25