There is a triangular board with an area of 76 square decimeters and a bottom of 19 decimeters. What is the height of this board? xiexie

There is a triangular board with an area of 76 square decimeters and a bottom of 19 decimeters. What is the height of this board? xiexie

Triangle area = bottom * height / 2
It can be seen that height = area * 2 / bottom
Then 76 * 2 / 19 = 8

The area of a triangular board is 2.7/9 square decimeters, the height is 1.1/9 decimeters, and how many decimeters is the bottom?
A certain team builds a canal, which is 7.1/5km in three days. At this speed, how many days will the remaining 19.1/5km be built?
Sound travels 277 and 1 / 2 meters in 5 / 6 seconds in the air. How many meters can it travel in 2 and 1 / 2 seconds?
Cars travel 65 kilometers per hour, cars travel 3 and 2 / 5 hours, trucks need 6 and 4 / 5 hours, how many kilometers per hour do trucks travel?

5 decimeters
8 days
832.5m
32.5 km / h

Among the four sticks of 5 cm, 6 cm, 7 cm and 8 cm in length, randomly choose three pendulum triangles. How many can they swing at most?

They are: 5cm, 6cm, 7cm;
5 cm, 6 cm, 8 cm;
5 cm, 7 cm, 8 cm;
Six centimeters, seven centimeters, eight centimeters