DOL M1 T3 L1

Which of these statements is true about the sum of the measures of the interior angles of a triangle?

• It equals 90°, because it's possible to arrange three copies of the same triangle so that the sum of its three angles forms a right angle.

• It equals 180°, because it's possible to arrange three copies of the same triangle so that the sum of its three angles forms a right angle.

• It equals 90°, because it's possible to arrange three copies of the same triangle so that the sum of its three angles forms a line.

• It equals 180°, because it's possible to arrange three copies of the same triangle so that the sum of its three angles forms a line.

Which equation could be written to solve for the unknown angle of Triangle ABC?

• 78 - 37+ ∠𝐵 = 180

• 78 + 37 = ∠𝐵

• 78 + 37 + 180 = ∠𝐵

• 78+ ∠𝐵 + 37 = 180

What is the measurement of ∠B?

• 90°

• 65°

• 41°

• 115°

Which statement correctly lists the measure of ∠𝑀 and the side lengths from shortest to longest?

• ∠𝑀 = 90°, Side l, Side k, Side m

• ∠𝑀 = 34°, Side l, Side m, Side k

• ∠𝑀 = 146°, Side k, Side m, Side l

• ∠𝑀 = 62°, Side k, Side l, Side m

In the triangle, ∠1=35° and ∠3=100°.

What is the measurement for ∠2?

In the triangle, ∠1=35° and ∠3=100°.

What is the measurement for ∠4?

Write an equation that relates angles ∠1, ∠3, and ∠4.

NOTE: Copy and Paste the angle names above to answer the question below.