Question

1. choose the correct answer.

a triangle with at least two congruent sides.
scalene
isosceles
corollary
remote interior angle

1. choose the correct answer.

a statement whose proof can be deduced directly from a previous theorem.
isosceles
scalene
corollary
remote interior angle

Explanation:

• For question 18: An isosceles triangle is defined as a triangle with at least two congruent (equal - length) sides. A scalene triangle has all sides of different lengths. A corollary is a statement that follows from a theorem. A remote interior angle is related to the exterior angle of a triangle.
• For question 19: A corollary is a statement whose proof can be deduced directly from a previous theorem. An isosceles triangle is a type of triangle. A scalene triangle is also a type of triangle. A remote interior angle is related to triangle angle - exterior angle relationships.

Answer:

1. isosceles
2. corollary