Okay second try please I need help!! Please Don't reply with links those are sketchy ​

Which of the following is the shape of a cross section of the figure shown below

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?