# McGraw Hill Math Grade 8 Lesson 20.1 Answer Key Triangles: Acute, Right, Obtuse, Equilateral, Isosceles, and Scalene

Practice the questions of McGraw Hill Math Grade 8 Answer Key PDF Lesson 20.1 Triangles: Acute, Right, Obtuse, Equilateral, Isosceles, and Scalene to secure good marks & knowledge in the exams.

## McGraw-Hill Math Grade 8 Answer Key Lesson 20.1 Triangles: Acute, Right, Obtuse, Equilateral, Isosceles, and Scalene

Exercises

IDENTIFY

Identity as acute, right, or obtuse.

Question 1.

Acute Triangle,

Explanation:
An acute angle triangle (or acute-angled triangle) isÂ a triangle in which all the interior angles are acute angles orÂ an acute angle is an angle that is less than 90Â°.
Given triangle has all interior angles, so it is acute triangle.

Question 2.

Obtuse Triangle,

Explanation:
An obtuse-angled triangle is a triangle in which one of the interior angles measures more than 90Â° degrees. Given triangle one of interior angle measures
more than 90Â° degrees, so it is obtuse triangle.

Question 3.

Right Triangle,

Explanation:
A rightÂ angledÂ triangleÂ is aÂ triangleÂ with one of the angles as 90 degrees.
As given triangle has one angle 90 degress so it is right triangle.

Question 4.

Acute Triangle,

Explanation:
An acute angle triangle (or acute-angled triangle) isÂ a triangle in which all the interior angles are acute angles orÂ an acute angle is an angle that is less than 90Â°.
Given triangle has interior angles less than 90 degress so it is acute triangle.

Question 5.

Right Triangle,

Explanation:
A rightÂ angledÂ triangleÂ is aÂ triangleÂ with one of the angles as 90 degrees.
As given triangle has one angle 90 degress, so it is right triangle.

Question 6.

Acute Triangle,

Explanation:
An acute angle triangle (or acute-angled triangle) isÂ a triangle in which all the interior angles are acute angles orÂ an acute angle is an angle that is less than 90Â°.
Given triangle has all interior angles are acute.

Identify as isosceles, scalene, or equilateral.

Question 7.

Equilateral Triangle,

Explanation:
All the given sides are 4 and equal so given triangle is equilateral triangle.

Question 8.

Isosceles Triangle,

Explanation:
As given triangle has 2 sides with 8 and one side with 4 lengths so it is an isosceles triangle. As an isosceles triangleÂ is a triangle that has any two sides equal in length and angles opposite to equal sides are equal in measure.

Question 9.