Classify Triangles By Its Angles and Sides

You connect four triangular pieces of fabric to make the kite. Classify the triangles by their angles and their sides.
The BLUE and RED Triangles are...

• The BLUE triangle is a scalene triangle; the RED triangle is an acute isosceles triangle.
• The BLUE triangle is an acute isosceles triangle; the RED triangle is an acute scalene triangle.
• The BLUE triangle is an obtuse equilateral triangle; the RED triangle is a right isosceles triangle.
• The BLUE triangle is a right isosceles triangle; the RED triangle is an obtuse scalene triangle.

Tags

TEKS.MATH.4.6C

The sum of the angles in all triangles is 180⁰

• True
• False

Tags

TEKS.MATH.7.11C

You connect four triangular pieces of fabric to make the kite. Classify the triangles by their angles and their sides.

The GREEN and YELLOW triangles are...

• The GREEN triangle is an obtuse isosceles triangle, and the YELLOW triangle is a right scalene triangle.
• The GREEN triangle is a right isosceles triangle, and the YELLOW triangle also a right isosceles triangle.

• The GREEN triangle is an acute isosceles triangle, and the YELLOW triangle is an acute scalene triangle.
• The GREEN triangle is an acute equilateral triangle, and the YELLOW triangle is a right isosceles triangle.

Tags

TEKS.MATH.4.6C

Is your friend correct?

Answer YES or NO

What does the red mark on each line of the triangle mean?

• The red mark indicates the triangle's perimeter.
• The red mark indicates the angles of the triangle, confirming it is equilateral.
• The red mark shows the triangle's area.
• The red mark represents the triangle's height.

Tags

TEKS.MATH.8.10A

The sum of all the angle measures in a triangle is 180⁰. A triangle has a 34⁰ angle and a 26⁰ angle. What kind of triangle is it?

• equilateral
• acute
• right
• obtuse

Tags

TEKS.MATH.7.11C

A designer creates the logo using identical triangles. Classify each triangle by its angles and its sides. Select three words to describe the triangle.

• obtuse

• equilateral

• equiangular

• acute

Tags

TEKS.MATH.4.6C

Carefully examine the triangle in the circle again. What is the PERIMETER of the triangle?

• 12 in
• 20 in
• 15 in
• 10 in

What is the PERIMETER of the LOGO?

• 15 in
• 60 sq in

• 60 in

• 12 in

This is an isosceles triangle because it has ​ (a)   sides that are congruent.

• two
• one
• all
• three

Tags

TEKS.MATH.1.6D