**Covid-19 has led the world to go through a phenomenal transition .**

**E-learning is the future today.**

**Stay Home , Stay Safe and keep learning!!!**

In this section, we will study the Area of Triangles, but triangles of several types of triangles such as acute triangle, right triangle, isosceles triangle, equilateral triangle and obtuse triangle.

1) Find the height of an acute triangle whose base is 20 cm and area is 150 cm

Area = ½ base x height

150 = ½ x 20 x height

150 = 10 x height

∴ height = 150 / 10 = 15 cm.

_________________________________________________________________

2) In a right triangle, if base is 20 m and height is 5 m, find the area of triangle.

Area = ½ x base x height

A = ½ x 20 x 5

A= 100 / 2

A = 50 m

Area = ½ x base x height

_________________________________________________________________

3) Find the area of isosceles right triangle, if one of the equal side is 20 in long.

In right triangle any one of the two sides which are at right angle can be taken as the base and other side as height.

Area = ½ x 20 x 20

Area = 200 cm

_________________________________________________________________

4) Find the area of equilateral triangle with sides 8 cm.

Area of equilateral triangle = ( √ 3 a

Area = ( √ 3 x 8

Area = ( √ 3 x 64 ) / 4

Triangle Area = 16 √ 3 cm

_________________________________________________________________

5) ABCD is a rectangle with dimensions 32 m by 18 m. ADE is a triangle such that EF ⊥ AD and EF = 14 cm. Calculate the area of the shaded region.

Area of rectangle ABCD = l x w

A = 32 x 18 = 576 m

Area of Triangle ADE = ½ x base x height

A = ½ x 18 x 14

A= 126 m

Area of shaded region = Area of rectangle ABCD – Area of triangle ADE

A = 576 – 126 = 450 m

∴ Area of shaded region = 450 m

• Perimeter and Area of Irregular Shape

• Area and Perimeter of the Rectangle

• Area of Square (perimeter of square)

• Perimeter of Parallelogram(Area of Parallelogram)

• Area of Rhombus(Perimeter of rhombus)

• Area of Trapezoid (Trapezium)

• Triangle Area (Perimeter of triangle)

• Herons Formula

7th grade math

Home

**Covid-19 has affected physical interactions between people.**

**Don't let it affect your learning.**

GMAT

GRE

1st Grade

2nd Grade

3rd Grade

4th Grade

5th Grade

6th Grade

7th grade math

8th grade math

9th grade math

10th grade math

11th grade math

12th grade math

Precalculus

Worksheets

Chapter wise Test

MCQ's

Math Dictionary

Graph Dictionary

Multiplicative tables

Math Teasers

NTSE

Chinese Numbers

CBSE Sample Papers