David B. answered • 09/29/20

Veteran High School Math teacher with 10 years of experience.

**For the given statement, write the if-then form, the converse,**

**the inverse, and the contrapositive.**

For these problems you need to know the following:

Conditional: If-then statement

Converse: Exchange the hypothesis and conclusion of your conditional (reverse order)

Inverse: Negate your conditional statement (Not statement)

Contrapositive: Both reverse and negate your Conditional

3.The measure of a straight angle is 180°

**Conditional:** If an angle is a straight angle, then its measure is 180.

**Converse: **If an angle has a measure of 180, then its a straight angle

**Inverse:** If an angle is not a straight angle, then its measure is not 180.

**Contrapositive:** If an angle doesn't have a measure of 180, then its not a straight angle.

4. A quadrilateral has four sides.

**Conditional:** If a figure is a quadrilateral, then it has four sides.

**Converse:** If a figure has four sides, then its a quadrilateral.

**Inverse:** If a figure is not a quadrilateral, then it doesn't have four sides.

**Contrapositive:** If a figure does not have four sides, then its not a quadrilateral.