A red ribbon is 18.84 decimeters long. Cut two-thirds of it to make a round stage prop. What's the radius of the prop?

A red ribbon is 18.84 decimeters long. Cut two-thirds of it to make a round stage prop. What's the radius of the prop?

Perimeter = 18.84 & # 10008; 2 / 3 = 12.56 decimeters

A yellow ribbon is 18 cm long and a red ribbon is 26 cm long. Cut the same part. After cutting, the red ribbon is twice as long as the yellow ribbon. How many meters is it?
Now there are more red ribbons than yellow
26-18 = 8 cm
Now there are more red ribbons than yellow
2-1 = 1 times
Now yellow ribbons are available
8 △ 1 = 8 cm (why divide by 1?)
Don't use the equation, write down the solution!
It's cut out
18-8 = 10 cm = 0.1 M

Now the red ribbon is 8 cm more than the yellow ribbon
That is to say, "the red ribbon is 8 cm more than the Yellow Ribbon" accounts for "1 times" of "the present yellow ribbon"
So "now yellow ribbon length" * 1: "red ribbon is 8 cm more than yellow ribbon"
"The red ribbon is 8 cm more than the Yellow Ribbon" △ 1 = "the current yellow ribbon length" (8 △ 1)
This should understand it
Another way: 18 - (26-18) = 10 cm

After a 2-meter-long log is cut into two sections along the bottom diameter, its surface area increases by 48 square decimeters. What is the original volume of the log?

Bottom area = 48 △ 2 = 24 square decimeters
2 m = 20 decimeters
Volume = 24 × 20 = 480 cubic decimeter