Figure on Same Base and between Same Parallels

Here we will learn about the figure on same base and between same parallels. We know the measure of the plane region enclose by a closed figure is called its area.

Area is measured in m², cm², and so on. We also know how to find area of different figure using different formulas. Here we will use the knowledge of these formulas by studying relationship between the areas of the figures when they lie on the same base and between same parallels.

Two geometric figures are said to be on the same base and between the same parallels, if they have a common side as base and vertices opposite to the common base lie on the line parallel to the base.

Solved example for the figure on same base and between same parallels:

1. Here ∆ABC and ∆DBC have the same base BC and are between the same parallel ‘p’ and BC.

Base and altitude of the figure

Base: Any side of the figure is called the base.

Altitude: A line segment joining the vertex and perpendicular to the opposite side is called the altitude.

2. ABC is right angled at B with BC = 6 cm and AC = 10 cm. also ∆ABC and ∆BCD are on the same base BC. Find the area of ∆BCD.

Solution:

In right angled ∆ ABC, AC = 10 cm and BC = 6 cm. using Pythagoras theorem, we get

AC² = AB² + BC²

10² = x² + 6²

⇒ x² = 10² – 6²

⇒ x² = 100 – 36

⇒ x² = 64

⇒ x = √64

⇒ x = √(8 × 8)

⇒ x = 8 cm

Now, since ∆ ABC and ∆BCD are on the same base BC.

Therefore, area of ∆ ABC = Area of ∆BCD

⇒ 1/2 × base × height = Area of ∆BCD

⇒ 1/2 × 6 × 8 = Area of ∆BCD

Therefore, area of ∆BCD = 6 × 4 cm²

= 24 cm²

Figure on Same Base and between Same Parallels

Parallelograms on Same Base and between Same Parallels

Parallelograms and Rectangles on Same Base and between Same Parallels

Triangle and Parallelogram on Same Base and between Same Parallels

Triangle on Same Base and between Same Parallels

8th Grade Math Practice

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