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Example 5 - Chapter 9 Class 7 Perimeter and Area
Last updated at Dec. 16, 2024 by Teachoo
Chapter 9 Class 7 Perimeter and Area
Concept wise
- Basic Definitions
- Square and Rectangle
- Converting Square to Rectangle
- Area of parallelogram
-
Area of triangle
- Circumference of circle
- Perimeter of a combination of shapes
- Area of circle
- Area of combination of figures - two circles, circle and square
- Finding Area of rectangle with path outside/inside
- Finding Area of rectangle with cross roads
- Finding Area of rectangle with triangle
Transcript
Example 5 Find BC, if the area of the triangle ABC is 36 cm2 and the height AD is 3 cm (Fig 11.21). Height = h = AD = 3 cm Base = b = BC = ? Given, Area of ∆ABC = 36 cm2 𝟏/𝟐 × b × h = 36 1/2 × BC × 3 = 36 BC × 3/2 = 36 BC = 36 × 𝟐/𝟑 BC = 12 × 2 BC = 24 cm ∴ BC is 24 cm
