Triangles (7th grade) UNFINISHED LEARNING

Presentation

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Mathematics

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7th Grade

•

Medium

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CCSS

8.G.A.5, 7.G.A.2, 7.G.B.5

Standards-aligned

Tricia White

Used 24+ times

FREE Resource

6 Slides • 8 Questions

Triangles (7th grade) UNFINISHED LEARNING

Write and solve an equation to find X.

Multiple Choice

Which equation can be used to solve for x?

x + 50 = 180

x - 50 = 180

180 + 50 = x

Vertical Angles

are congruent

share a common vertex

are opposite each other

Multiple Choice

Find the measure of x.

120

180

Triangles = 180 degrees

3 angles
are measured by their sides and angles
Impossible to have more than 1 right angle in a triangle.
Impossible to have more than 1 obtuse angle in a triangle

Multiple Choice

Find the measure of angle b.

180

100

Multiple Choice

Find the measure of angle a

180

An infinite number of triangles can be created using the same three angle measures (e.g., there are many triangles with angles whose measures are 45○, 60○, and 75○).

Triangles and Side Lengths

To form a triangle using side lengths, the sum of any two sides must be greater than the length of the third side.
Ex. 2cm, 3cm, 5cm will NOT make a traingle becuase 2 + 3 is NOT larger than the third side
Ex. 3cm, 3cm, 5cm will make a triangle because 3 + 3 is larger than the length of the greratest side 5cm.

Multiple Choice

Can you draw a triangle with sides that are 13 cm, 5 cm and 6 cm?

NO because 5 + 6 is not larger than 13

YES because 5 + 6 is larger than the longest side

Multiple Choice

What would be the measure of the third angle in a triangle formed from these parts?

180 = 53 + 34 + x

180

Multiple Choice

Can line segments measuring 8, 5, 4 form a triangle?

Yes. 4 + 5 > 8

No. 4 + 5 < 8

Multiple Choice

Can a triangle be formed with 3 sides of equal lengths?

Yes. Ex. 3 + 3 > 3

No. 3 + 3 < 3

Triangles (7th grade) UNFINISHED LEARNING

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