Triangle Construction and Properties

The video tutorial demonstrates how to construct triangles using given angles and sides. It covers the use of a protractor to measure angles and a ruler to measure sides. The tutorial includes examples of constructing triangles with only angles, such as triangle EFG, and with both angles and sides, such as triangles PQR and BCD. The importance of ensuring the sum of angles equals 180 degrees is emphasized throughout.

What tool is essential for constructing a triangle when only the angles are given?

• Protractor

• Ruler

• Calculator

• Compass

If a triangle has angles of 50, 65, and 65 degrees, what type of triangle is it?

• Equilateral

• Isosceles

• Right

• Scalene

What is the sum of all angles in a triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

How do you determine the length of the initial line when constructing a triangle with given angles?

• Estimate the length

• Use a fixed length

• The length is not specified

• Draw a random length

What is the missing angle in triangle EFG if angles E and F are 40 and 80 degrees respectively?

• 50 degrees

• 60 degrees

• 70 degrees

• 90 degrees

When constructing a triangle, why is it important to draw initial lines lightly?

• To avoid mistakes

• To make it look neat

• To make it easier to erase

• To save ink

In triangle PQR, what is the length of the base PR?

• 5 cm

• 4 cm

• 7 cm

• 6 cm

What is the angle at point P in triangle PQR?

• 120 degrees

• 110 degrees

• 100 degrees

• 90 degrees

How do you ensure the accuracy of the angles when constructing a triangle?

• Use a compass

• Use a ruler

• Use a protractor

• Use a calculator

What is the length of line PQ in triangle PQR?

• 6 cm

• 5 cm

• 4 cm

• 7 cm