A. V = 1/3. luas alas. t
= 1/3. 24. 24. 9
= 1728
B. Lp = L alas + 4 L segitiga
= 24. 24 + 4. 1/2. 24. √(9²+(24/2)²)
= 576 + 48. 15
= 576 + 720
= 1296
Luas permukaan limas = 4×luas sisi tegak+luas alas
Tinggi sisi tegak (pythagoras)
a² = √b²+c²
a² =√12²+9²
a² =√144+81
a² =√225
a² =15 cm
Luas permukaan = 4×180+576 = 1.296 cm²
Volume = ⅓×luas alas×tinggi
V = ⅓×576×9
V = 1728cm³
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A. V = 1/3. luas alas. t
= 1/3. 24. 24. 9
= 1728
B. Lp = L alas + 4 L segitiga
= 24. 24 + 4. 1/2. 24. √(9²+(24/2)²)
= 576 + 48. 15
= 576 + 720
= 1296
Luas permukaan limas = 4×luas sisi tegak+luas alas
Tinggi sisi tegak (pythagoras)
a² = √b²+c²
a² =√12²+9²
a² =√144+81
a² =√225
a² =15 cm
Luas permukaan = 4×180+576 = 1.296 cm²
Volume = ⅓×luas alas×tinggi
V = ⅓×576×9
V = 1728cm³