solve the equation
for every sums
Answers
Answer:
1. 48cm 2. Somu is wrong. 3. Rs 12,60,000 4. Rs. 17,85,000 5. (1) 20cm2. (2) twice. (3) 15cm2. (4) 20cm2.
Step-by-step explanation:
1. a = 1/2bh
864 = 1/2 × 36 × x
x = 864/18
x = 48cm
b = 48cm.
2. As the diagonal divides the rectangle in two equal and congruent triangles.
3. length of the sides = 80m & 180m.
a = 1/2 bh
a = 1/2 × 80 × 180
a = 80 × 90
a = 7200m2
the cost of leveling per m2 = R175
Therefore,
The cost of levelling the entire plot = 175 × 7200
= Rs 12,60,000.
4. length of the sides = 60m & 170m.
a = 1/2 bh
a = 1/2 × 60 × 170
a = 60 × 85
a = 5100 m2
the cost of
Therefore, the cost of building per m2 = R350
The cost of levelling the entire plot = 350 × 5100
= Rs 17,85,000.
5. (obs ques)
(1) a = 1/2bh
a = 1/2 × 8 × 5
a = 4 × 5 = 20cm2
(2) twice
as area(rect) is 40m2 (l*b) which is 2 times the area(triangle) (40/20=2)
(3) a = 1/2bh
a = 1/2 × 6 × 5
a = 3 × 5 = 15cm2
(4) The area of triangle ADB is the same as triangle ABC because the diagonal divides the rectangle in two equal and congruent triangles.
Therefore, the area of triangle ABD = 20cm.