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I ‘i if = 5) cm, des an i. des parallel. Can a trapezium have its (*, ides equal, , , , , , , , , , , , , , , , , , , , , , , , , , , The stanclere Ua Measuring an angle is degree (°), errant, Angles between 0° arog are acute, 90° js right angle, angles between 90° and 180° are, between 180° and 360° are reflex angles,, endicular lines are two lines that interse, “t angled triangle is the one whose all a;, Bs cconcied triangle has one angle that is greater than 90°,, 4 htangled triangle has one angle which is equal to 90"., 9 iangle having all unequal sides is called q scalene triangle., A a: having two sides equal is called an isosceles triangle., pi having all sides equal is called an equilateral triangle., oes f the interior angles of a triangle is 180°., The Pcl is a simple closed figure bounded by four line segments., ee, ilaterals are:, Some special ct whose opposite sides are parallel and equal., Feit iciogram with all sides equal., ee aM uadrilateral with one pair of opposite sides parallel., eas Blelogram whose each angle measures 90°., er an whose all sides are equal., ae drilateral whose pair of adjacent sides are equal., ee d figure having 3 or more sides is called a polygon., i a eee sides and angles equal is called a regular polygon., A polygon, , ct to form right angles., Ingles are less than 90°,, , (Revision Gxercise, , bjective Type Questions, Fill in the blanks. :, (a) The unit of measurement of an angle is, , ; degrees., int i O, (b) 1 complete rotation of a line about a point is a : naaiiiiie sso:, (c) A triangle whose all the sides are eee is know = Gc., (d) A triangle whose two sides are equal is known a: ADD dd ae, , A isa, (e) A quadrilateral with exactly two sides parallel is, , Pry Short Answer Questions, What fraction of, of a clock turn t, (a) 2 to 5?, , (b) 12 to 99, , , , , , , , a revolution clockwise does the hour hand, hrough, when it goes from, , , , Understanding Two Dir