Penjelasan dengan langkah-langkah:

1. C

2. B

jumlah sudut segitiga adalah 180°

180° = <abc + <acb + <bac

180° = 40° + 75° + <bac

180° = 115° + <bac

180° - 115° = <bac

65° = <bac

3. C

180° = 90° + 55° + <acb

180° = 145° + <acb

35° = <acb

4. A

∆klm adalah segitiga sama sisi maka,

<mkl = <klm = 75°

<kml = 180° - (<mkl + <klm)

<kml = 180° - 150° = 30°

5. D

180° = x + 2x + 3x

180° = 6x

180°/6 = x

30° = x

6. C

K ∆klm = 60cm

2x + 5x + 8x = 60cm

15x = 60cm

x = 60cm/15 = 4cm

panjang ml = 5x = 5(4) = 20cm

7. B

K∆abc = 44cm

a + a + 8 + 2a - 4 = 44cm

4a + 4 = 44cm

4a = 44cm - 4

4a = 40cm

a = 10cm

panjang bc = 2a - 4 = 2(10) - 4 = 20 - 4 = 16cm