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E1. Using formulae : substitute numbers Use the above display to find answers to these questions. 1. A solution of the equation x2+4x+4=0 2. The area of a circle of radius 5 cm. 3. The area of a triangle with base 5cm and height 6cm. 4. The hypotenuse of a triangle whose other sides are 5cm and 12cm. 5. The circumference of a circle of radius 4cm. 6. The volume of a prism of cross section 8 cm2 and length 2cm.