triangles
DESCRIPTION
Triangles. SPI 6.4.2 I CAN identify and find missing angles measures in triangles. A triangle is a closed figure with three line segments and three angles. . Equilateral Triangle. ALL three sides and angles equal in measure. In the figure below , the slash marks indicate equal measure. - PowerPoint PPT PresentationTRANSCRIPT
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TRIANGLESSPI 6.4.2 I CAN identify and find
missing angles measures in triangles.
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A triangle is a closed figure with three line segments and three angles.
Classify TrianglesSides AnglesEquilateral Acute
Isosceles Obtuse
Scalene Right
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Equilateral TriangleALL three sides and angles equal in measure. In the figure below , the slash marks indicate equal measure.
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Isosceles TriangleAt least 2 sides/angles have equal measure. In the figure below , the slash marks indicate equal measure.
62 62
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Scalene TriangleAll three sides of different measures (no equal sides).
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Right Trianglecontains a right angle (90 ͦ)
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Obtuse TriangleContains at least 1 obtuse angle (greater than 90° but less than 180°)
123
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Acute Triangle
All acute angles (less than 90°)
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The sum of the measures of the angles of any triangle always equals 180 degrees.
A + B + C = 180°
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This is a proof that the angles in a triangle equal 180°:
The top line (that touches the top of the triangle) is running parallel to the base of the triangle. A straight line or angle equals 180 degrees.
A + B + C = 180°
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Find the missing angle c?
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Question 1The measure of two angles are 45° and 45
°. A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 2The measure of two angles are 15 ° and 47 °. A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 3The measures of two angles are 53 ° and 76
° . A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 4The measure of one angle is 18 °.A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 5The measure of one angle is 90 degrees.A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 6The measure of one angle is 115 degrees. A. AcuteB. RightC. ObtuseD. Cannot be determined
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Question 7The sides measures of a triangle is 10 cm, 5 cm, and 10 cm. Classify this triangle?
A. ScaleneB. AcuteC. IsoscelesD. Obtuse
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Find the missing angle c?
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Find the missing angle c?
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Find the missing angle b?
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