If you want to do this:
Ihavetwosolutions,onewithLinearanotherwithrelativelayour,followsLinear,initIcreatedotherlayoutsinside,onewithverticalorientationtoputtheEdittext,andanotherhorizontaltoseparatethislayoutfromtheEdittextwiththebuttonbyweight.
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1"
>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:digits="1234567890.,"
android:ems="10"
android:id="@+id/editTextComercial"
android:hint="Diametro Comercial"
android:maxLines="1" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:inputType="numberDecimal"
android:digits="1234567890.,"
android:ems="10"
android:id="@+id/editTextVC"
android:hint="Velocidade de Corte"
android:maxLines="1" />
</LinearLayout>
<Button
android:text="Calcular "
android:layout_marginTop="5dp"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/buttonCalc"
android:layout_weight="2"
/>
</LinearLayout>
<TextView
android:text="TextView"
android:visibility="invisible"
android:gravity="center"
android:textSize="16dp"
android:textStyle="bold"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewResultRPM" />
In the relative layout it was a bit more complicated, but the solution is simpler, just add: android:layout_toEndOf="@id/editTextComercial"
android:layout_alignBottom="@id/editTextVC"
to power the button at the end of the width and bottom of the Edit text, of course a value must be added in width two Edit text.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:digits="1234567890.,"
android:ems="10"
android:id="@+id/editTextComercial"
android:hint="Diametro Comercial"
android:maxLines="1"
android:layout_marginTop="10dp"
android:layout_alignParentStart="true" />
<TextView
android:text="TextView"
android:visibility="invisible"
android:gravity="center"
android:textSize="16dp"
android:textStyle="bold"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:id="@+id/textViewResultRPM"
android:layout_below="@+id/editTextVC"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:digits="1234567890.,"
android:ems="10"
android:id="@+id/editTextVC"
android:hint="Velocidade de Corte"
android:maxLines="1"
android:layout_below="@+id/editTextComercial"
android:layout_alignParentStart="true" />
<Button
android:text="Calcular "
android:layout_height="wrap_content"
android:id="@+id/buttonCalc"
android:layout_width="match_parent"
android:layout_toEndOf="@id/editTextComercial"
android:layout_alignBottom="@id/editTextVC"
android:layout_alignTop="@+id/editTextComercial" />