Question

26. 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 its third side?
(b) The perimeter of square is 40 cm, what is the side length?
(c) An equilateral triangle of perimeter 90 cm, what is the side length?
(d) The length of the rectangle is 10 cm and perimeter is 30 cm, what is the other side

Answer 1

Answer:I have given the answer below step by step

Step-by-step explanation:

a. Perimeter=36cm.A triangle has three sides

Adding all the sides is perimeter

So, 12cm+14cm+x=36cm

26cm+x=36cm

x=36cm-26cm

x=10cm

b. Perimeter of the square =40cm

Let us use perimeter of square formula. 4*side

4*x=40

x=40/4

x=10cm

c. Equilateral triangle all sides are equal. Perimeter is adding all the side

So, x+x+x=90cm

3x=90cm

X=90/3

x=30

d.length=10cm,breath=x,perimeter=30cm

Let us use the perimeter of rectangle formula

2(l+b)

2(10+x)=30

20+2x=30

2x=30-20

2x=10

x=10/2

x=5