Basic Concept in Geometry

On a number line, points A, B and C are such that d(A,C) = 10, d(C,B) = 8 .  Find d(A, B) considering all possibilities.

Write the following statement in conditional form.

A number having only two divisors is called a prime number.

Write the converse of the following statement.

If the sum of measures of two angles is 90⁰ then they are complement of each other.

Write the converse of the following statement.

If the corresponding angles formed by a transversal of two lines are congruent then the two lines are parallel.

Write the converse of the following statement.

If the sum of the digits of a number is divisible by 3 then the number is divisible by 3.