23.dari gambar di bawah ini,besar sudut b adalah

Penjelasan dengan langkah-langkah:

Pertanyaan 1

Sudut segitiga besarnya 180°

2x + 3x + 80° = 180°

5x + 80° = 180°

5x = 180° – 80°

5x = 100°

x = 100° ÷ 5

x = 20°

Besar < B

= 3x

= 3 × 20°

= 60°

Pertanyaan 2

Besar pelurus B

= 180° – 130°

= 50°

Besar pelurus C

= 180° – 110°

= 70°

Besar A

= 180° – (50° + 70°)

= 180° – 120°

= 60°

Jawaban:

23) C. 60°

24) B. 60°

Penjelasan dengan langkah-langkah:

23) 3x + 2x + 80° = 180°

5x = 180° – 80°

5x = 100°

x = 100° ÷ 5

x = 20°

< B = 3x = 3×20° = 60°

24) < C = 180° – 110° = 70°

< B = 180° – 130° = 50°

< A = 180° – 70° – 50° = 60°