Question

The sum of the three angles formed inside a triangle are equal to ____ degrees?

D-I are the measurements of the lengths of the sides of triangles. Identify the types of
triangles

d. 45 cm 61 cm 60 cm e. 30 cm, 31cm, 30 cm f. 4 cm, 5ft, 4 cm
g. 89mm, 89mm, 89mm h. 9 in, 5in, 3 in i. 22cm, 22cm, 22in


J-O are the measurements of the angles of triangles. Identify the type of triangle.
j. 900, 350, 550 k. 600, 600, 600 l. 700, 550, 550
m. 350, 400, 1000 n. 460, 460, 440 o. 1200, 300, 300,

Answer 1

The sum of the interior angles of a triangle is 180 degrees.

d. Scalene

e. Isosceles

f. Isosceles

g. Equilateral

h. Scalene

i. Equilateral

j. Right

l. Acute

m. Obtuse - doesn't add to 180 not a triangle

n. Acute - doesn't add to 180 not a triangle

o. Obtuse

Explanation:

The interior angles of a triangle add to 180 degrees. There are two ways we classify triangle by side lengths and angle measures.

Side lengths: Compare the side lengths and see if any are equal to determine the type.

• Scalene: 3 different lengths
• Isosceles: 2 equal lengths and 1 different
• Equilateral : 3 equal sides

Angle Measures: Compare the angles measures to 90 degrees.

• Right: If one angle is equal to 90
• Acute: All angles are less than 90 degrees
• Obtuse: One angle is greater than 90 degrees