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1. Construct a quadrilateral LION, where LI = 4 cm, IO = 5.5 cm, ON = 6 cm, NL = 3.5 cm and LO = 8 cm.
2. The circumference of a circle is 15.7 cm. Find the diameter.
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Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.
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