Geometry — Flashcards

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Step 1: Place the protractor's center on the vertex of the angle. Step 2: Align the base line with one arm of the angle. Step 3: Read the scale where the other arm crosses. If it reads 60°, it’s an ac…

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Step 1: Place the protractor on line XY with its center at point X. Step 2: Find 75° on the protractor scale (lower one starting from 0°). Step 3: Mark a point Z at 75°. Step 4: Remove the protractor …

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Step 1: Check side lengths — two sides are equal (5 cm and 5 cm). Step 2: A triangle with two equal sides is an isosceles triangle. Answer: Isosceles triangle.

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Step 1: All three angles are less than 90°. Step 2: A triangle with all angles less than 90° is an acute triangle. Answer: Acute triangle.

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Step 1: Sum of angles in a triangle = 180°. Step 2: Third angle = 180° – (90° + 45°) = 45°. Step 3: One angle is 90° → right triangle. Two angles equal → isosceles. Answer: 45°, Right Isosceles Triang…

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Formula: Area = ½ × base × height Step 1: Plug in values → ½ × 6 × 4 Step 2: Multiply → ½ × 24 = 12 Answer: 12 cm²…

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Step 1: In a right triangle, the legs are base and height. Step 2: Use formula: Area = ½ × b × h = ½ × 8 × 15 Step 3: 8 × 15 = 120 → ½ × 120 = 60 Answer: 60 cm²…

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Use this formula to find the area of any triangle when you know the base and the perpendicular height. Example: Triangle with base 10 cm, height 7 cm → Area = ½ × 10 × 7 = 35 cm².