Question

(Hurry) guys pls help me, i don’t understand what my teacher taught me

Answer 1

Explanation:

me too i dont know

Answer 2

• 8 cm
• ≈ 117.6 cm³

Explanation:

Total surface area:

• A = 4(1/2*7*l) + 7² = 14l + 49, where l is a slant height

We are given:

• A = 161 cm²

Find the value of l:

• 14l + 49 = 161
• 14l = 112
• l = 112/14
• l = 8 cm

Use Pythagorean to find the height h of the pyramid:

• l² = h² + (7/2)²
• 8² = h² + 3.5²
• h² = 8² - 3.5²
• h² = 51.75
• h = √51.75
• h ≈ 7.2 cm

Find the volume:

• V = 1/3Bh
• V = 1/3*7²*7.2
• V = 117.6 cm³