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Study Island Flash Cards A rectangle must have ______ right angles. A rectangle must have four right angles. right triangle A. acute What type of triangle is shown above? The measures of the angles in a triangle are 73°, 52°, and 55°. What type of triangle is this? A. acute B. right C. obtuse Copyright © 2012 Study Island - All rights reserved. Study Island Flash Cards A triangle has three sides with lengths of 46 cm. equilateral triangle What type of triangle is it? square pyramid What figure has 5 vertices, 4 triangular faces, and 1 square base? The measures of two angles in a triangle are 55° and 43°. What is the measure of the third angle? Copyright © 2012 Study Island - All rights reserved. 82° Study Island Flash Cards Two angles in a triangle measure 51° each. 78° 10 cm isosceles triangle What is the measure of the third angle? Note: Figure is not drawn to scale If X = 6 cm and Y = 8 cm, what is the length of Z? A triangle has two angles with measures of 35°. What type of triangle is it? Copyright © 2012 Study Island - All rights reserved. Study Island Flash Cards Note: Figure is not drawn to scale If X = 2.5 cm and Z = 6.5 cm, what is the length of Y? Copyright © 2012 Study Island - All rights reserved. 6 cm