# Elementary Geometry

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We know geometry is an important one in math. Geometry concerned with shape, size and properties. In geometry we have some topics to know first. These are Point, line, line segment, ray. We can say point has no dimension, only position. We know line is set of points with no end. We know plane is a flat surface which extending indefinitely in all directions. We can find the area and circumference of a circle. We know the formula to find the circumference of a circle, that is 2 x π x r.

Example1: If the radius of the circle is 21 cm. Find the Circumference of the circle.

Solution: Radius of the circle =r = 21 cm

We know the formula to find the circumference of a circle

That is circumference = 2 x π x r

Now we can plug the values in this formula, then we have

circumference of circle = 2 x π x r

= 2 x 22/7x 21

= 132 cm.

Example2: If the sides of a triangle are 4 cm, 3 cm and 5 cm. Then find the Area of the triangle.

Solution: From the problem, we can write