Number Systems

8 Topics | 8 Quizzes
Polynomials

6 Topics | 8 Quizzes
Coordinate Geometry

3 Topics | 4 Quizzes
Linear Equations in Two Variables

5 Topics | 7 Quizzes
Introduction to Euclid’s Geometry

3 Topics | 4 Quizzes
Lines and Angles

7 Topics | 6 Quizzes
Triangles

5 Topics | 4 Quizzes
Quadrilaterals

5 Topics | 5 Quizzes
Areas of Parallelogram and Triangles

5 Topics | 4 Quizzes
Circles

5 Topics | 4 Quizzes
Constructions

4 Topics | 3 Quizzes
Heron’s Formula

4 Topics | 4 Quizzes
Surface Areas and Volumes

5 Topics | 2 Quizzes
Statistics

5 Topics | 2 Quizzes
Probability

3 Topics | 4 Quizzes
If two lines are parallel with a common line then these two lines will also be parallel to each other.

If AB ∥ CD and EF ∥ CD then AB ∥ EF.

**Example**

Find x and y.

**Solution**

A + B + C = 180° (Angle sum property)

30° + 42° + x = 180°

x = 180°- (30° + 42°)

x = 108°

And y is the exterior angle and the two opposite angles are A and B.

So,

BCD = A + B (Exterior angle is equal to the sum of the two interior opposite angles).

y = 30° + 42°

y = 72°

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