At each corner of a triangular field of side 30 m, 51 m, 63m, a horse is tied by a rope of length 7 m. Find the area of ungrazed field -

556 m² 368 m²  675 m²  688 m²

688 m²

30, 51, 63 form a triplet Area of the triangle = \(\frac{1}{2}\) x 30 x 51 = 765 m² Area grazed by the horse = area of semi - circle                                        =  \(\frac{154}{2}\) = 77m² Area of ungrazed field = 765 - 77 = 688 m²