7 a What fraction of a circle is this shape? b Work out the area of the whole circle. Round your answer to 1 decimal place. c Work out the area of the sector shown. d Work out the circumference of the whole circle. Round your answer to 1 decimal place. e Work out the length of the blue arc. f Work out the perimeter of the sector. Q7c hint Use your answers to parts a and b. 10 cm Q7e hint 10 cm 8 For this shape, work out a the area b the perimeter. Round your answer to 1 decimal place. Q7f hint 6.2 cm 9 Work out the area of this compound shape. Round your answer to 1 decimal place. 10 cm Q8 hint Use the method in Q7. 3 cm Q9 hint 20 cm Divide the shape into a rectangle and a semicircle. Working with 3D solids 1 Sketch all the faces of each solid. Label all the lengths. The first one has been started for you. a b 5 cm 1 cm a c 3 cm 5 cm 4 cm 3 cm 4 cm 4 cm 5 cm 4 cm 3 cm 1 cm 2 Draw the plan, front elevation and side elevation of each solid in Q1 on squared paper. 4 cm 3 cm Q2 hint 3 Work out the surface area of this triangular prism. 10 cm Q3 hint 8 cm 7 cm 6 cm Sketch each face. Work out the area of each face and add them together. Unit 3 2D shapes and 3D solids 66