# 4.2.3. Triangles

Calculate the perimeter of the triangle.

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is a triangle where cm, cm, and cm. Calculate its perimeter.

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If , , and , what is the type of according to the measures of its angles?

• Aacute triangle
• Bright triangle
• Cobtuse triangle
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What is the type of according to its side lengths?

• Aequilateral triangle
• Bscalene triangle
• Cisosceles triangle
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What is the type of the triangle according to the measures of its angles?

• Aright triangle
• Bacute triangle
• Cobtuse triangle
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In a triangle , and . According to the measures of the angles, what is the type of the triangle?

• Aacute-angled
• Bobtuse-angled
• Cright-angled
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is a triangle, if and , find .

• A
• B
• C
• D
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Given that is a triangle where , and , then .

• A
• B
• C
• D
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Given that ABC is a triangle where , and , then .

• A
• B
• C
• D
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If cm, cm, and cm, what is the type of according to its side lengths?

• Ascalene triangle
• Bisosceles triangle
• Cequilateral triangle
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Given that and , find .

• A
• B
• C
• D
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The triangle whose side lengths are cm, cm, and cm is called a scalene triangle.

• A4
• B11
• C9
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Are , , and measures of the angles of a triangle?

• Ayes
• Bno
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