Angles Recall an angle and recognize acute, right, obtuse, straight and reflex angle We have learn’t about an angle and its different types in previous classes. However we recall these con
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Draw Acute and Obtuse angles of different measures using Protractor Draw an Acute Angle Draw an angle of measure 40°. Steps of Construction: (I)Draw a ray QR (II)Place the straight
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Draw an angle equal in measure to a given angle Steps of Construction (I)Measure the given angle ABC with the help of a protractor that is ∠ABC=50°. We have to draw an angle equal
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Draw an angle twice in measure to a given angle. Steps of Construction (i)Measure the given angle ABC with the help of a protractor ∠ABC=40°. We have to draw an angle twice in m
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Draw an angle equal in measure to the sum of two angles Steps of Construction (I)Measure the given angles ABC and LMN with the help of protractor and note that ∠ABC = 40° and ∠LMN =
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Construction of Angels We have to construct a right angle, a straight angle and a reflex angle. We shall construct these angles one by one. Right Angle Construct an angle whose measure
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Straight Angle Straight Angle Construct an angle of measure 180° Steps of Construction: 1.Draw a ray QR 2.Place a protractor on QR such that its central point falls on Q and th
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Reflex Angle Construct an angle of measure 210°. Now, 210° = 180° + 30° Steps of Construction: (i)Draw a ray YZ. (ii)Place a protractor on \(\overrightarrow{YZ}\)
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Triangles Definition of a Triangle A triangle is a simple closed figure having three sides and three angles. (i) In the given triangle ABC: (ii)A, B and C are the vertices. (iii)AB, BC a
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Construction of triangles when three sides are given Equilateral Triangle Example: Draw an equilateral triangle PQR whose measure of each side is 3cm. Solution: Steps of Construction
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Quadrilateral A closed plane figure with four sides is known at as a quadrilateral. It has also four angles and four vertices.
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Recognize the kinds of Quadrilateral Following are the different kinds of quadrilateral. (i) Square (ii) Rectangle
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Construction of Square and Rectangle Square We know that a square has four equal sides and each angle is of 90° . Example Construct a square with length of each side 2.5cm. Sol
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