The radius of a round flower bed is 15m. If a rose is planted every 0.3m around the flower bed, how many roses can be planted

The radius of a round flower bed is 15m. If a rose is planted every 0.3m around the flower bed, how many roses can be planted

15*2*3.14=94.2（m）
94.2 / 0.3 = 314 (strains)

What is the noun form of exercise?

"Exact" is a noun,
On the first floor, the answer is adjective, and its adjective is exact

On the sine theorem
In the triangle ABC, cos a = 5 / 13, Tan B / 2 + 1 / Tan B / 2 = 10 / 3, C = 21, find the area of COS (a-b) and triangle ABC

Is it Tan (B / 2) + 1 / Tan (B / 2) = 10 / 3

English past tense usage
The past tense of was went

Was is the past tense of is / am, were is the past tense of are eg: I was watch TV last week
We were watch TV last week.
Eg: I went to the library
Did you play soccer yesterday?
He didn't play soccer yesterday

Principle of pinhole imaging

Principle: the straight-line transmission of light, the sun to human light and heat, which is an indispensable light source. But due to the rotation of the earth, the formation of day and night. Every night, the dark enveloped the earth. Living in ancient human ancestors, the night is powerless. Darkness gives people a terrible, hateful feeling, until now

(1) What is the difference between actual capacitance and inductor and ideal capacitance and inductor?

The actual capacitance will change slightly with the change of frequency; the actual capacitance has inductive reactance at high frequency because of the existence of lead wire
The actual inductor has coil resistance and distributed capacitance

What is the significance of China's social reform in terms of the principle of socialist basic contradiction
Basic principles of Marxism

The basic contradiction of socialism is the contradiction between the productive forces and the relations of production, the economic base and the superstructure, which is mainly manifested in the contradiction between the advanced social system and the backward social productive forces
The contradiction between people's increasing material and spiritual needs and backward social production is the basic contradiction in the primary stage of socialism
Combined with the reform situation

Should singular or plural be added after favorite?
RT, favorite is the most favorite. Should it be singular?
e.g.My favourite animal is rabbit.
How can I see these two kinds of statements
My favorite animal is rabbits
My favorite animal are rabbit
Please tell me which of the three sentences is right? Or those are right? I'm so confused~

1.My favourite animal is rabbit.
This sentence is correct. Rabbit refers to an animal, in the singular
2.My favourite animal is rabbits.
Because the subject is my favorite animal, the verb be uses is
I like all rabbits
3.My favourite animal are rabbits.
This sentence is wrong. It should be changed from animal to animals
In addition to the meaning of "favorite", it also has the meaning of "special favorite". It can be followed by the singular or plural of the noun

A cylinder, height 12cm, bottom radius 5cm, surface area
Of course, the surface area is the whole.

Bottom area = 3.14x5 & # 178; = 78.5cm2
Side area = 3.14x2x5x12 = 376.8cm2
Surface area = 376.8 + 78.5x2 = 533.8 square centimeter

The greatest common factor of 8 and 10 is (.), and the least common multiple is (.)

The greatest common factor is (2), and the least common multiple is (40)