Task 2: Write a short paragraph to describe your internet habits. Remember to include information such as how often you go online, about how many hours each day you are
online, and what your favorite internet sites are.

Question

Геометрия: Task 2: Write a short paragraph to describe your internet habits. Remember to include information such as how often you go online, about how many hours each day you are online, and what your favorite internet sites are.​

madievazarina · Accepted Answer

Пусть РАВС - данная пирамида, Р-вершина, РО = √13 см - высота,
РА=РВ=РС=6 см

1. Рассмотрим Δ АОР - прямоугольный.
АО²+РО²=РА² - (по теореме Пифагора)
АО = √(РА²-РО²) = √(6² - (√13)²) = √(36-13) = √23 (см)

2. АО является радиусом описанной окружности.
R=(a√3) / 3
a= (3R) / √3 = (3√23)/√3 = √69 (см) - это длина стороны основы.

3. Находим периметр основы.
Р=3а
Р=3√69 см

4. Проводим РМ - апофему и находим ее.
Рассмотрим Δ АМР - прямоугольный.
АМ=0,5АВ=0,5√69 см
АМ²+РМ²=РА² - (по теореме Пифагора)
РМ = √(РА²-АМ²) = √(6² - (0,5√69)²) = √(36-17,25) = √18,75 = 2,5√3 (см)

5. Находим площадь боковой поверхности пирамиды.
Р = 1/2 Р₀l
Р = 1/2 · 3√69 · 2,5√3 = 3,75√207 = 3,75·3√23 = 11,25√23 (см²)

ответ. 11,25 √23 см².

Task 2: Write a short paragraph to describe your internet habits. Remember to include information such as how often you go online, about how many hours each day you areonline, and what your favorite internet sites are.​

MOGZ ответил

Task 2: Write a short paragraph to describe your internet habits. Remember to include information such as how often you go online, about how many hours each day you are
online, and what your favorite internet sites are.