This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
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Ili kupata eneo la duara, tunatumia fomula A = r^2, ambapo r ni rediasi na = (22)/(7). a) Rediasi r = 7 cm. Step 1: Tumia fomula ya eneo la duara. A = r^2 Step 2: Badilisha thamani za na r. A = (22)/(7) × (7 cm)^2 A = (22)/(7) × 49 cm^2 Step 3: Rahisisha hesabu. A = 22 × 7 cm^2 A = 154 cm^2 Eneo la duara ni 154 cm^2. b) Kipenyo d = 28 cm. Kwanza, tafuta rediasi r = (d)/(2). Step 1: Tafuta rediasi. r = 28 cm2 = 14 cm Step 2: Tumia fomula ya eneo la duara. A = r^2 Step 3: Badilisha thamani za na r. A = (22)/(7) × (14 cm)^2 A = (22)/(7) × 196 cm^2 Step 4: Rahisisha hesabu. A = 22 × 28 cm^2 A = 616 cm^2 Eneo la duara ni 616 cm^2. c) Kipenyo d = 70 cm. Kwanza, tafuta rediasi r = (d)/(2). Step 1: Tafuta rediasi. r = 70 cm2 = 35 cm Step 2: Tumia fomula ya eneo la duara. A = r^2 Step 3: Badilisha thamani za na r. A = (22)/(7) × (35 cm)^2 A = (22)/(7) × 1225 cm^2 Step 4: Rahisisha hesabu. A = 22 × 175 cm^2 A = 3850 cm^2 Eneo la duara ni 3850 cm^2. d) Rediasi r = 1.4 m. Step 1: Tumia fomula ya eneo la duara. A = r^2 Step 2: Badilisha thamani za na r. A = (22)/(7) × (1.4 m)^2 A = (22)/(7) × 1.96 m^2 Step 3: Rahisisha hesabu. A = 22 × 0.28 m^2 A = 6.16 m^2 Eneo la duara ni 6.16 m^2. Tuma swali linalofuata 📸