After 10 hours: 80 × 2 = 160 cm³
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- After 4 hours: 10 × 2 = 20 cm³
- After 6 hours: 20 × 2 = 40 cm³
- After 8 hours: 40 × 2 = 80 cm³
- After 12 hours: 160 × 2 = 320 cm³
- A retired engineer is building a model bridge using identical triangular supports. Each triangle has a base of 30 cm and height of 16 cm. What is the total area of all triangles if he uses 15 supports?
- Area of one triangle = (base × height) / 2 = (30 × 16) / 2 = 240 cm²
