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Worksheet 2 Fig. 12.1312Construct a quadrilateral ABCD in which AB = 4 cm, BC = 3 cm, CD = 3.5 cmdiagonals are AC = 6 cm and BD = 5.5 cm.2.Construct a quadrilateral ABCD in which AB = BC = 5 cm, CD = 6 cm, diagoare 7 cm each.3.Construct a quadrilateral ABCD in which three sides are 4 cm each and bediagonals are 6 cm each.208 |
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Answer» Mathematics NCERT Grade 7, Chapter 11: Perimeter and AREA- This chapter gives all the details about the perimeter and area of plane figures. FIRSTLY the chapter discusses squares and rectangles. Perimeter is the distance AROUND a closed FIGURE whereas area is the part of the plane occupied by the closed figure. The perimeter of the following geometrical shapes are discussed in the first section:SquarePerimeter of a square = 4 × sideRectanglePerimeter of a rectangle = 2 × (length + breadth)The section is divided into two sub-parts:1. Triangles as parts of rectangles2. GENERALISING for other congruent parts of rectanglesBefore moving onto exercise 11.2, the topics Area of triangle and parallelogram are discussed. Area of a square = side × sideArea of a rectangle = length × breadthArea of a parallelogram = base × heightArea of a triangle =1/2 × base × h |
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