Download Parent Page L98 - Hempfield Curriculum

Name
1
Triangles
LESSON
98
CC.5.G.3
OBJECTIVE Classify and draw triangles using their properties.
You can classify triangles by the length of their sides and
by the measure of their angles. Classify each triangle.
Use a ruler to measure the side lengths.
Use the corner of a sheet of
paper to classify the angles.
• equilateral triangle
All sides are the same
length.
• acute triangle
All three angles are acute.
• isosceles triangle
Two sides are the same
length.
• obtuse triangle
One angle is obtuse. The
other two angles are acute.
• scalene triangle
All sides are different
lengths.
• right triangle
One angle is right. The other
two angles are acute.
Classify the triangle according to its side lengths.
It has two congruent sides.
The triangle is an isosceles triangle.
© Houghton Mifflin Harcourt Publishing Company
Classify the triangle according to its angle measures.
It has one right angle.
The triangle is a right triangle.
Classify each triangle. Write isosceles, scalene, or equilateral.
Then write acute, obtuse, or right.
1.
2.
9 mi
78°
14 mi
66°
Geometry
3.
10 m
4m
5 in.
36°
10 m
5 in.
15 mi
4.
5 in.
5.
6.
195
Name
1
Triangles
CC.5.G.3
Classify each triangle. Write isosceles, scalene, or equilateral.
Then write acute, obtuse, or right.
1.
2.
8 mm
118°
6 mm
37°
53°
10 mm
42 in.
None of the side measures are equal.
So, it is
scalene
angle, so it is a
3.
. There is a right
right
triangle.
4.
50 cm
15 cm
22°
50 cm
.`e%
),`e%
)+`e%
5. sides: 44 mm, 28 mm, 24 mm
angles: 110°, 40°, 30°
6. sides: 23 mm, 20 mm, 13 mm
angles: 62°, 72°, 46°
Problem Solving
7. Mary says the pen for her horse is an
acute right triangle. Is this possible?
Explain.
196
8. Karen says every equilateral triangle is
acute. Is this true? Explain.
Lesson 98
© Houghton Mifflin Harcourt Publishing Company
A triangle has sides with the lengths and angle measures given.
Classify each triangle. Write scalene, isosceles, or equilateral.
Then write acute, obtuse, or right.