Question

Let Us Revise
A. Tick () mark the correct answer :
1. If the breadth of a rectangle is 25% of its length and the area of the rectangle is 400 cm², then its
length is :
(a) 75 cm
(b) 40 cm
(c) 38 cm
(d) 35 cm
2. If the sides of a rectangle are in the ratio of 1 : 3 and its area is 300 m², then its perimeter is :
(a) 80 m
(b) 8013 m
(c) 40 m
(d) 4012 m
3. If the sides of areas of two circles is 1 : 16, then ratio in their perimeters is :
(a) 1:2
(b) 2:1
(c) 1:4
(d) 4:1
4. The ratio of a rectangle, whose perimeter is 400 m and the ratio in length and breadth is 3 : 1, is
(a) 5000 m2 (b) 6500 m²
(c) 7500 m² (d) 6000 m²
B. 1. Find the area of a parallelogram whose base is 35 m and corresponding altitude is 30 m.
2. In a parallelogram the base and its corresponding altitudes are in the ratio of 5 : 2. If the area
the parallelogram is 360 m², find the base and the altitude.
3. Find the area of a right-angled isosceles triangle if one of the equal sides is 46 cm long.​

Answer 1

Answer:

1. (a)

2.(c)

3. (b)

4. (b)