![]() Answer: R S Aggarwal Solutions - Mathematics - Class 9 chapter Lines. The sum of all 3 interior angles of a triangle is equal to 180°. Prove that the bisectors of two adjacent supplementary angles include a right angle. Solved Examples On AnglesĮxample 1: Find missing angle x in the figure.Įxample 3: In a triangle ABC, ∠A = 90 and ∠B = 30. There are many daily life examples of an angle, such as cloth-hangers, arrowheads, scissors, partly opened doors, pyramids, edge of a table, the edge of a ruler, etc. Wall clocks use the concept of angles to show time with hour and minute hands.Artists use their measurement knowledge to sketch or create art pieces. ![]() Carpenters use it to make equipment like doors, chairs, sofas, tables, etc.Athletes use its concept in sports to enhance their performance.Engineers construct buildings, bridges, houses, monuments, etc., using angle measurement.Mark the degree of the angle made where two sides of the straight line intersect.Draw a straight line joining those two points, O and B.Now mark the point as B on the top circular part of a protractor, according to the preferred angle for example 40°.You may select whole numbers or decimal numbers for the problems and configure the worksheet for 6, 8 or 10 problems. Now, place the protractor at that point, and its midpoint should touch the marked point O. Find Supplementary Angles Worksheets These Angles Worksheets are great for practicing finding missing angles from supplementary angle pairs.How to Construct an Angle (using protractor) Here, ∠AXD and ∠CXD are supplementary angles. Supplementary angles: Angles that add up to 180° (a straight angle) are called supplementary angles. Here, ∠BXC and ∠CXD are complementary angles. Complementary and Supplementary Angles:Ĭomplementary angles: Angles that add up to 90° (a right angle) are called complementary angles. ![]() Here, ∠ABC, ∠BCA and ∠CAB are interior angles.Įxterior angles: Exterior angles are the angles formed outside a shape, between any side of a shape and an extended adjacent side. Interior angles: Interior Angles are the angles formed within or inside a shape.
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