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Special triangles
Question # 26
4.1.1 Identify the attributes of
special triangles (isosceles,
equilateral, right)
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To do problems like these, you need to look at all the
answers, and know the definition of each type of special
triangle listed, then select the correct one.
Scalene triangle – has no congruent sides.
Isosceles triangle –at least 2 congruent sides.
Equilateral triangle – has 3 congruent sides. Also
an equilateral triangle is also a equiangular triangle.
Right triangle – one angle is 90°.
Acute triangle – all angles are less than 90°.
Obtuse triangle – one angle is greater than 90°.
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Example: Which of the following statements is true?
A. A scalene triangle has no congruent sides.
B. A scalene triangle has exactly two congruent
sides.
C. An equilateral triangle has exactly two
congruent sides.
D. An isosceles triangle is also an equilateral
triangle. False – an isosceles may only have 2 congruent sides, and
equilateral triangle has to have 3
False it has exactly 3
False- a scalene triangle has no congruent sides
True – a scalene triangle has no congruent sides.
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1. Which of the following statements is true?
A. A scalene triangle has three congruent sides.
B. A scalene triangle has exactly two congruent
sides.
C. An equilateral triangle has exactly two
congruent sides.
D. An equilateral triangle is also an Isosceles
triangle.
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2. Which of the following statements is true?
A. A scalene triangle has two congruent sides.
B. All angles in a scalene triangle are different.
C. An equilateral triangle has exactly two
congruent sides.
D. An isosceles triangle is also an equilateral
triangle.
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3. Which of the following statements is true?
A. A scalene triangle has three congruent sides.
B. A scalene triangle has exactly two congruent
sides.
C. All sides of an equilateral triangle are
congruent.
D. An isosceles triangle is also an equilateral
triangle.
