Find the area of the shaded figure

Express result to the accuracy of 2 decimal.
Category: 
Correct Answers: 
82
Points: 
1

Calculate the number 410

NUMBERMANIA: Calculate the number 410 using numbers [2, 8, 4, 1, 67, 287] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
1
Points: 
10

Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Category: 
Correct Answers: 
14
Points: 
8

Calculate the number 690

NUMBERMANIA: Calculate the number 690 using numbers [7, 8, 4, 5, 10, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
10
Points: 
3

Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Category: 
Correct Answers: 
6
Points: 
5
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