1. A quadrilateral has four sides.
If-then form
Converse
Inverse
Contrapositive
2. An isosceles triangle has a pair of congruent sides.
If-then form
Converse
Inverse
Contrapositive
3. Perpendicular lines intersect.
If-then form
Converse
Inverse
Contrapositive
4. An eighteen-year old Filipino can cast his vote during election.
If-then form
Converse
Inverse
Contrapositive
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Answer:
1. If-then form: If it is a quadrilateral, then it has four sides.
Converse: If it has four sides, then it is quadrilateral.
Inverse: If it is not a quadrilateral, then it doesn't have four sides.
Contrapositive: If it doesn't have four sides, then it is not quadrilateral.
2. If-then form: If a triangle is an isosceles, then it has a pair of congruent sides.
Converse: If a triangle has a pair of congruent sides, then it is an isosceles triangle.
Inverse: If a triangle is not an isosceles, then it doesn't have a pair of congruent sides.
Contrapositive: If a triangle doesn't have a pair of congruent sides, then it is not an isosceles triangle.
3. If-then form: If the lines are perpendicular, then they intersect.
Converse: If the lines intersect, then they are perpendicular.
Inverse: If the lines are not perpendicular, then they don't intersect.
Contrapositive: If the lines don't intersect, then they are not perpendicular.