Triangle Angles and Relationships

The video tutorial explains how to solve a geometry problem involving a square ABCD, a perpendicular bisector FG, and a circle centered at B. The goal is to find the measure of angle BED. The solution involves identifying congruent triangles, recognizing an equilateral triangle, and using properties of isosceles triangles to calculate the desired angle.

What is the significance of quadrilateral ABCD being a square?

• It is a rectangle.

• All sides are of different lengths.

• It has no right angles.

• All angles are 90 degrees.

What is the role of FG in relation to BC?

• FG is a perpendicular bisector of BC.

• FG is a diagonal of the square.

• FG is parallel to BC.

• FG is a tangent to BC.

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CCSS.HSG.CO.C.9

What is suggested to help solve the problem of finding angle BED?

• Ignore the circle.

• Draw triangles to split the angle.

• Use a calculator.

• Use algebraic equations.

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CCSS.HSG.CO.B.7

How are triangles EBG and ECG related?

• They are similar.

• They are congruent by side-angle-side.

• They are unrelated.

• They are identical.

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CCSS.4.G.A.2

What type of triangle is BEC?

• Equilateral triangle

• Isosceles triangle

• Scalene triangle

• Right triangle

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CCSS.7.G.B.5

What is the measure of angle BEC?

• 120 degrees

• 60 degrees

• 45 degrees

• 90 degrees

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CCSS.8.G.A.5

What is the relationship between angles in an isosceles triangle?

• It has no congruent angles.

• All angles are 90 degrees.

• Base angles are congruent.

• All angles are different.

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CCSS.8.G.A.5

How do you calculate the base angles of an isosceles triangle if one angle is known?

• Subtract the known angle from 180 and divide by 2.

• Subtract the known angle from 90.

• Multiply the known angle by 2.

• Add the known angle to 180 and divide by 2.

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CCSS.7.G.B.5

What is the final measure of angle BED?

• 135 degrees

• 150 degrees

• 90 degrees

• 120 degrees

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CCSS.8.G.A.5

What is the sum of angles in a triangle?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

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CCSS.8.G.A.5