A street garden covers three fourths of an hectare, half of which are lawns, 20% are flower beds, and the rest are sidewalks What are the total area of lawn and flower bed? & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; what are the total area of lawn and flower bed;                                                      3. 

A street garden covers three fourths of an hectare, half of which are lawns, 20% are flower beds, and the rest are sidewalks What are the total area of lawn and flower bed? & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; what are the total area of lawn and flower bed;                                                      3. 

1、
Lawns and flower beds
=3 / 4 × (1 / 2 + 20%)
=3 / 4 × 70% = 0.525 ha
2、
The lawn is larger than the flower bed
=3 / 4 × (1 / 2-20%)
=3 / 4 × 30%
=225 ha
3、
Question: what is the area of the sidewalk?
Sidewalk area
=3 / 4-0.525
=225 ha

6. A street garden in a city, covering a total area of 4 / 5 hectares, of which 2 / 5 lawn and 3 / 10 flower garden
(1) What is the total area of lawn and flower bed?
(2) How much larger is the lawn than the flower bed?

(1) 4 / 5 × (2 / 5 + 3 / 10) = 14 / 25 ha
(2) 4 / 5 × (2 / 5-3 / 10) = 2 / 25 ha

A triangle has a bottom of 3 decimeters and a height of 4 decimeters. What is its area?

Bottom multiply height divide 2