Page 62 - WCS - Electrical
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WORKSHOP CALCULATION & SCIENCE - CITS




                                                                     2
                                                             = 3 x  5 − 3 2
                                                             = 3 x  25 −  9
                                                             = 3 x  16
                                                             = 3 x 4
                                                             = 12 cm²
                                                      o  r
                                                               1       2    2
                                                      A      =       b    b
                                                                  b 4a −
                                                               4
                                                               1          2   2
                                                                  b
                                                             =       x 6  4  x  5 − 6
                                                               4
                                                               1
                                                                  b
                                                             =       x 6 x 8
                                                               4
                                                             = 12 cm²

           5  Find its height if an isosceles triangle has base of 200 mm and its area is 2000 mm².
                                                      Base   = 200 mm
                                                      Area   = 2000 mm²
                                                      h      = ?
                                                   1
                                                        x   x b x h   =  A
                                                      bh
                                                   2
                                                   1
                                                      bh
                                                        x   x 200 x h =  2000
                                                   2
                                                               200  x  2
                                                             h  =          = 20 mm
                                                                 200
           6  Find the area of an equilateral triangle whose side is 5 cm.




















                                                                 3
                                                      Area   =      a² unit²
                                                                4
                                                               1.732
                                                             =       x 5 x 5
                                                                 4

                                                             = 10.825 cm²





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                                            CITS : WCS - Electrical - Exercise 5
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