V. Match the following:- 5 x 1 = 5
16. Tetra means - zero angle
17. 135° is called - 3
18. 35° is called - 4
19. x+5 = 8 - acute angle
20. 0° is called - obtuse angle
please match the question
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Answers
Answer:
16-4
17-obtuse angle
18-acute angle
19-3
20-zero qngle
Step-by-step explanation:
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Step-by-step explanation:
Types of Angles - Acute, Right, Obtuse, Straight and Reflex Angles
When two lines intersect, at the point of their intersection an angle is formed. Learning about angles is important, as they form the base of geometry. The two rays that form the angle are known as the sides of the angle. Also, it is not necessary that an angle is formed by intersection of two straight lines; it can be formed by intersection of two curved lines too.
There are various types of angles based on their measure of the angle. The types are,
Acute angle
Right angle
Obtuse angle
Straight angle
Reflex angle
Types of Angles
1. Acute Angle
An angle which measures less than 90° is called an acute angle. The measure between 0° to 90°. In the picture below, the angle formed by the intersection of PQ and QR at Q forms an angle PQR which measures 45°. Thus, PQR is called an acute angle.
2. Right Angle
An angle which measures exactly 90° is called a right angle. It is generally formed when two lines are perpendicular to each other. In the figure below, line AB intersects line BC at B and form an angle ABC which measures 90°.
3. Obtuse Angle
An angle that measures greater than 90° is known as the obtuse angle. The angle measure ranges from 90° to 180°. An obtuse angle can also be found out if we have the measure of the acute angle.
Obtuse Angle Measure = (180 - acute angle measure)
In the picture above, line segment DO intersects line segment OQ at point O and forms an angle DOQ measuring 120°. Thus, it is an obtuse angle.
Also, if we extend line OQ to OP then we can find a measure of the acute angle.
DOP = 180° - DOQ = 180° - 120° = 60°