1. Calculator

Taking 1+2 as an example, first input 1+2, then click Compute button , you will get the calculated results 3 in the next line with calculated result identifier >>>.

2. Photo calculator
3. Step-by-step guidance
• Four arithmetic operation

$\begin{array}{l}\mathrm{1+2*\left(5*6-2\right)+8*9}\\ \mathrm{>>>1+2*\left(30-2\right)+8*9}\\ \mathrm{>>>1+2*\left(28\right)+8*9}\\ \mathrm{>>>1+56+72}\\ \mathrm{>>>57+72}\\ \mathrm{>>>129}\end{array}$

• Select or move the geometry

Drag coordinate system

Delete the selected geometry

Clear

• Point

Select two points to create midpoint

Separation of attachment point from parent object

• Create segment with two points

Fixed length line:select a point and enter the length of the segment

Create line with two points

Create ray with two points

Create vector with two points

Polyline:select all the vertices in turn, then click the first point

• Perpendicular line:select a point and a straight line to be vertical

Perpendicular bisector line:select two points or a line segment

Parallel line:select a point and a line to parallel

Equal vector:select a point and a vector to parallel

Angle bisector:select three points or two straight lines

Tangent line:select a point and a circle

Polar line:select a point and a circle

• Polygon:select all the vertices in turn, then click the first point

Regular polygon:select two points and enter vertex number

• Circle:select center point of the circle and a point in circlein turn

Circle:select not three points on the same line

Compasses:select a point to determine the center of the circle and a segment to determine the radius of the circle

Semicircle arc:select two points,draw from the starting point to the end of the counter clockwise

Circular arc:select the center,the starting point,the end point in turn,draw from the starting point to the end of the counter clockwise

Circular arc:select not three points on the same line

Circular sector:select the center,the starting point,the end point in turn

Circular sector:select not three points on the same line

• Measure

Coordinate

Equation

Length

Distance

Angle

Slope

Perimeter

Area