Question

Solve the following
(a) Two sides of a triangle are 12 cm and 14 cm. The perimeter of the triangle is 36 cm. What is the
length of its third side?
(b) The perimeter of square is 40 cm, what is the length of each side?
(c) An equilateral triangle of perimeter 90 cm, what is the length of each side?
(d) The length of the rectangle is 10 cm and perimeter is 30 cm, what is the other side?
(e) Rectangular field is 250 m long and 75 m wide find its area
(f) Perimeter of a square whose field is 64 m. Find its area
(g) The Area of a rectangle is 1560 sq. cm and its length is 60 cm .Find its breadth
(h) A floor is 7 m long and 5m wide. A square carpet of side 4m is laid on the floor. Find the area of
the floor that is not carpeted
(i) Find the area of a rectangle whose length is 135cm and breadth 1.2 m​

Answer 1

Given two sides of the triangle are 12cm and 14cm

 the perimeter of triangle =36cm

 Let the length of the third side =acm 

the perimeter of triangle = sum of the length of sides of the triangle. 

Accoreding to problem, 

12+14+a=36

 ⇒26+a=36 

 ⇒a=36−26 

 ⇒a=10 

 ∴ length of the third side of triangle =10cm

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