Jawaban:

1. D

2. B

3. B

4. A

5. C

6. B

7. B

8. –

9. B

10. B

11. A

12. A

13. B

Penjelasan dengan langkah-langkah:

PYTHAGORAS dan BANGUN DATAR

1. 20²+21²=29²

400+441 = 841

2. 6²+8²>9²

36+64 > 81

100 > 81

3. QR = √(17²–8²) = √(289–64) = √225 = 15 cm

4. d2 = 2×√(68/4)²–(30/2)² = 2×√(17²–15²)

d2 = 2×√(289–225) = 2×√64 = 2×8 = 16 cm

5. L1 : L2 = (10/5)² : (25/5)² = 4 : 25

6. dB = (64/4)√2 = 16√2 cm

7. j = √(12²–8²) = √(144–64) = √80 = 4√5 m

8. d.a = √(41²–9²) = √(1.681–81) = √1.600 = 40 cm

BC = √(40²–16²) = √(1.600–256) = √1.344 cm

BC = 8√21 cm

9. dB = √(20²+(200/20)² = √(400+100) = √500

dB = 10√5 cm

10. Luas Lingkaran = 22/7 × 28 × 28 = 616 × 4 = 2.464 cm²

besar sudut = 308/2.464 × 360° = 45°

11. K = 2 × 22/7 × 21 = 44 × 3 = 132 cm

L = 22/7 × 21² = 22 × 441/7 = 22 × 63 = 1.386 cm²

12. Luas = 3,14 × (62,8/3,14)²/4 = 314 cm²

13. dB = (60/4)√2 = 15√2 cm